Use the Adobe Reader plugin to view or download PDF files

Adobe Reader is a free program for viewing and printing PDF documents.
It includes an Adobe Acrobat browser plugin for displaying PDF documents within Firefox and other Web browsers. (By default, Firefox uses its built-in PDF Viewer.) This article provides resources for setting up Adobe Reader and the browser plugin on your computer.

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Installing and updating Adobe Reader

To install Adobe Reader, please visit the Adobe.com website. To make sure your installation of Adobe Reader includes the latest available security and stability updates, open Adobe Reader, click on the Help menu and then click Check for Updates….

Adobe does not yet maintain a browser plugin for viewing PDF files in Firefox on Mac OS X; instead, you can use the built-in PDF Viewer.

Viewing PDF files outside of Firefox

At the top of the Adobe Reader window, click the Edit menu, and select Preferences…, to open the Preferences window.

In the left pane of the Adobe Reader Preferences window, select the Internet section.

Uncheck Display PDF in browser.

You can set Firefox to open PDF files outside of Firefox instead of using the built-in PDF viewer:

At the top of the Firefox window, click on the Firefox button and then select Options.At the top of the Firefox window, click on the Tools menu and then select Options.On the menu bar, click on the Firefox menu and select Preferences....At the top of the Firefox window, click on the Edit menu and select Preferences.

Click the menu button
and choose Options.Preferences.

Select the Applications panel.

Find Portable Document Format (PDF) in the list and click on it to select it.

Click on the drop-down arrow in the Action column for the above entry and select Use Adobe Reader (default).

Click OK to close the Options window.Click Close to close the Preferences window.Close the Preferences window.

Uninstalling Adobe Reader

The Adobe support site has these instructions for uninstalling Adobe Reader: